docs: def render(self, name, value, attrs=None):
          """
          Render the ``icekit_events/recurrence_rule_widget/render.html``
          template with the following context:
  
              rendered_widgets
                  The rendered widgets.
              id
                  The ``id`` attribute from the ``attrs`` keyword argument.
              recurrence_rules
                  A JSON object mapping recurrence rules to their primary keys.
  
          The default template adds JavaScript event handlers that update the
          ``Textarea`` and ``Select`` widgets when they are updated.
          """
          rendered_widgets = super(RecurrenceRuleWidget, self).render(
              name, value, attrs)
          template = loader.get_template(
              'icekit_events/recurrence_rule_widget/render.html')
          recurrence_rules = json.dumps(dict(
              self.queryset.values_list('pk', 'recurrence_rule')))
          context = Context({
              'rendered_widgets': rendered_widgets,
              'id': attrs['id'],
              'recurrence_rules': recurrence_rules,
          })
          return template.render(context)